Corrected entry: From the first time we meet the character 10K, he states that his goal is to kill 10,000 zombies (hence his nickname), and he prefers to carry out his mercy killings with what is only vaguely described as a "sniper rifle." Currently, sniper rifles trend toward larger-caliber rounds, between .338 and .50 caliber, for their long-distance accuracy. For the sake of discussion, let us assume that the character 10K is using the smaller .338 sniper rifle. If so, he must be secretly carrying an ENORMOUS bulk of ammunition: Just ten .338 rounds weigh approximately one pound; a thousand .338 rounds would weigh approximately one hundred pounds; ten thousand .338 rounds would weigh approximately one thousand pounds (half a ton). The character 10K has already killed over a thousand zombies by the first time we meet him. By the end of the second season, he has scored well over 3,200 kills (he counts them off in every episode), even though he only shoots two or three zombies per episode. This suggests that he's used several hundred pounds of ammo thus far; yet, we have never seen him carry anything other than a small-sized backpack. Unless he's buying, bartering or stealing hundreds of pounds of "sniper ammo" behind the scenes in post-apocalypse America (an unlikely proposition), there's no way that 10K could lug around the volume of ammunition that is suggested, particularly since the team is on-foot much of the time.

Correction:In the first and second season from what I've seen 10K carries a variety of different rifles, some of them not necessarily sniper rifles. For some time he had an SR20, in another episode I saw him with a Mauser 98k which would infer that they re up on weapons and ammo in between the parts of the show that we actually see.